Isn't it a waste of time to debate an idea that is subjective, but held with passionate intensity by the "believer"?

Fluther is a good place to witness this futile exercise.
The list of subjective, but passionately embraced ideas is almost endless, but a few that often show up on this site are

There is a God
Morality is a social convention
Wealth is a zero sum game
Poverty causes crime
The individual is subordinate to the state
Etc.

Offering real evidence and/or flawless argument to refute these “beliefs” is a waste of time. If one is epistemologically commited to being a subjectivist, then one has no interest in objectivity anyway. So any debate becomes a dog chasing it’s own tail. Which happens here often enough, and every place else for that matter.

So why bother? The only real choices are give up the argument, or use force to stop it. Since using force is risky, expensive and unpredictable and is thus attractive only to the most ammoral, lunatics in our midst (except in a democracy, where you can hire thugs with your vote), what is left but to give it up and start living another day?